I was comparing my 145.022-68 Transitional Step dial applied logo with my 105.012-66 this morning
and when i look at the dial it seems like the minute indices that start after step are shorter on the 145.022 dial as they are on the 105.012. (the indices on my 145.012-68 have the same dimensions as the 105.012 dial)
Thats why the outer rim and the T swiss made T on the 145.012 is much more present as on the 105.012.
Is it just me , maybe a different thickness of the crystal? Both are original Omega Crystals.

 

I think it is the rehaut - as you say it's down to the crystal.

 

Just checked the crystal logo again, both have a fainted old logo, which is barely visible, so none of it has a modern replacement crystal